Shiva Tapped Horn - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 166 Old 01-30-10, 12:09 PM
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Fred
 
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Re: Shiva Tapped Horn

Quote:
maxmercy wrote: View Post
Kevin, if there is a chance you'd be interested in me folding up either of these two, let me know. A tapped horn may be able to dig better to 15Hz, and that's why lilmike is here...I am not as good at tapped design as I am with front-loaded designs...


JSS
How about a 'fold along with me' session for those of us that have never done this?

I have 0 design expertise, but I'm pretty good with DIY and have played enough with REW to be able to measure reasonably well. I also have the perfect 1pi space: a concrete construction apartment and the perfect corner to put one of these. 300-400 liters will leave me enough room for proper corner loading.

I would love to be able to fold up one of these. Now that I have some models to aim for, I will keep plugging away to see how you get from where I am starting to where you guys are, but I don't know if I can do that in a reasonable amount of time.

Or, to put it another way, I don't have all the toys, but I really, really wanna play too!
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post #62 of 166 Old 01-30-10, 12:14 PM
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Mike
 
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Re: Shiva Tapped Horn

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fredk wrote: View Post
How about a 'fold along with me' session for those of us that have never done this?
Stay tuned, we're working on it.

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post #63 of 166 Old 01-30-10, 12:30 PM
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publius
 
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Re: Shiva Tapped Horn

sister thread over on avs:

http://www.avsforum.com/avs-vb/showthread.php?t=1222125

i'll update the avs with a link over this way so that it is a two way street.
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post #64 of 166 Old 01-30-10, 12:44 PM
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Fred
 
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Re: Shiva Tapped Horn

I know you guys have been working on it. I'm just impatient. Now quit posting and get at 'er!
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post #65 of 166 Old 01-30-10, 01:10 PM
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Fred
 
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Re: Shiva Tapped Horn

For giggles, and to encourage others at the beginning of the learning curve, here is my first kick at the can, tapped horn:




The first try is grey. The first is just over 400 liters with a large mouth (1500 cm^2) the second increases s1 slightly but has a significantly smaller mouth (980 cm^2). That takes it down to 337 liters.

I don't think its going to reach 15Hz so I need to increase path length I guess.
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post #66 of 166 Old 01-30-10, 01:27 PM
Kevin
 
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Re: Shiva Tapped Horn

A version with a 20Hz corner would make sense too. There are some people that insist on LF corners and others wanting the extra output that a 20Hz corner would bring.

I'm not limiting you guys in any way for the contest. You can choose your box size, corner and bandwidth with complete freedom. Also it matters not what type of horn you use. The only basis for judging the design is size, bandwidth, and output. Of course the practicality of construction is important too.

The reason for this is two-fold. First... it is fun to get everyone involved. Often people come at problems from different directions so collaboration breeds innovation. Second, I want something people can copy so that I can sell more drivers.

Once we come to a design consensus I'll build and measure one. I just don't have time to build a dozen designs. Also... the Shiva-X2 is probably the best candidate for horns. I know people are asking about the Tempest & Maelstroms but they are the wrong drivers for the application. Trust me... even without running simulation I can tell you that the enclosure sizes would be unrealistic.

Kevin Haskins
Exodus Audio
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post #67 of 166 Old 01-30-10, 01:34 PM
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Mike
 
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Re: Shiva Tapped Horn

Quote:
fredk wrote: View Post
For giggles, and to encourage others at the beginning of the learning curve, here is my first kick at the can, tapped horn:




The first try is grey. The first is just over 400 liters with a large mouth (1500 cm^2) the second increases s1 slightly but has a significantly smaller mouth (980 cm^2). That takes it down to 337 liters.

I don't think its going to reach 15Hz so I need to increase path length I guess.
You're on the right track, you can use a longer mouth segment to kill that 60 Hz dip too.

Don't know if you have seen these over at AVS, they might help:

Simple Offset Driver HornResp Tutorial

Simple Tapped Horn Tutorial using Hornresp

Hey - waitaminute - wasn't this some sort of design contest???

Here I am helping my competition.....

Last edited by littlemike; 01-31-10 at 02:36 PM. Reason: I typed a dumb
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post #68 of 166 Old 01-30-10, 01:39 PM
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publius
 
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Re: Shiva Tapped Horn

"give us the napkin drawing next. ;-)"

kevin, here is a napkin drawing. again, not a tapped horn, but a formidable one.

i haven't worked out all the measurements/angles/etc., but something like this should replicate the sim more or less.

question: what compression ratio is the max for the shiva driver?

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post #69 of 166 Old 01-30-10, 01:44 PM
Kevin
 
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Re: Shiva Tapped Horn

Quote:
littlemike wrote: View Post
You're on the right track, you can use a longer throat segment to kill that 60 Hz dip too.

Don't know if you have seen these over at AVS, they might help:

Simple Offset Driver HornResp Tutorial

Simple Tapped Horn Tutorial using Hornresp

Hey - waitaminute - wasn't this some sort of design contest???

Here I am helping my competition.....
I'll make it worth your while. ;-) I'll reward those who contribute the most and I exercise the right to do so based upon my own metrics.

We could also design a driver but I'd rather start with the Shiva first. Doing a production run of drivers cost money.

Kevin Haskins
Exodus Audio
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post #70 of 166 Old 01-30-10, 01:49 PM
Kevin
 
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Re: Shiva Tapped Horn

Quote:
publius wrote: View Post

kevin, here is a napkin drawing. again, not a tapped horn, but a formidable one.

question: what compression ratio is the max for the shiva driver?
As I said, it doesn't matter if it is tapped or not. Only the results matter. In terms of the compression ratio the answer is "I don't know". I didn't design it around a horn and it wasn't part of the design constraint. I don't think you are going to see a huge difference among drivers of the same size/format though in terms of what is acceptable for that compression ratio. I'd need to build the horn and destructively test a couple to see where the limits are.

You are only going to see those ratios under full bore/stroke so lets not get excited about 4:1 at this point.

Kevin Haskins
Exodus Audio
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